Method for restraining and reducing reduction degradation of iron sand pellets and system special for method for restraining and reducing reduction degradation of iron sand pellets

Abstract

The invention discloses a method for restraining and reducing reduction degradation of iron sand pellets and a system special for the method for restraining and reducing the reduction degradation of the iron sand pellets. The method for restraining and reducing the reduction degradation of the iron sand pellets comprises the steps that iron sand is ground to be fine, so that iron sand powder is obtained; the iron sand powder is evenly mixed with bentonite, so that a mixture is obtained; the mixture is made into green pellets in a pelletizer, wherein when the mixture in made into the green pellets in the pelletizer, a boric acid water solution is added in the growing process of the green pellets to be used as a pelletizing solution; and the green pellets are roasted, so that the pellets are obtained. The invention further discloses the system special for the method for restraining and reducing the reduction degradation of the iron sand pellets. According to the method for restraining and reducing the reduction degradation of the iron sand pellets and the system special for the method for restraining and reducing the reduction degradation of the iron sand pellets, by the adoption of the feature that boric acid is low in melting point, the liquid phase forming temperature is lowered, the content of calcium ferrite in the pellets is increased, and the reduction temperature of phosphosiderite pellets is greatly lowered; and in this way, the metallurgical performance of the phosphosiderite pellets in the reduction process is greatly improved, serious degradation at the high temperature is restrained, the problem that reduction degradation is serious during blast furnace smelting of the iron sand is effectively solved, the energy consumption is greatly lowered, the furnace condition is lowered, and economic benefits are increased.

Description

technical field [0001] The invention relates to a method for suppressing and reducing reduction pulverization of sea sand pellets and a special system thereof, belonging to the field of preparation of sea sand ore metallurgical pellets. Background technique [0002] Sea placer is a kind of secondary enriched iron placer ore formed by the action of rivers, waves, tides and ocean currents in the seashore area. Its main useful mineral components are vanadium, titanium and iron. After beneficiation, it can obtain Iron concentrate of vanadium and titanium. Coastal countries such as Southeast Asia, Australia, and New Zealand have abundant sea sand ore reserves and relatively stable iron content, which have gradually attracted attention in recent years. [0003] The traditional treatment methods of sea-sand ore include sintering and pelletizing. Adding too much vanadium-titanium sea-sand ore in sintering will lead to poor cold strength and low-temperature reduction pulverization p...

AI Technical Summary

Problems solved by technology

[0008] The main technical problem to be solved by the present invention is to overcome the serious problem of reduction pulverization in the existing sea-sand ore blast furnace smelting, and provide a method for suppressing and reducing the reduction and pulverization of sea-sand pellets, including: grinding the sea-sand ore Finely, sea sand ore powder is obtained; sea sand ore powder and bentonite are mixed evenly to obtain a mixture; the mixture is made into green pellets in a pelletizer; the green pellets are roasted to obtain pellets; it is characterized in that: When the mixture is made into green pellets in the pelletizer, boric acid aqueous solution is added as pelletizing water during the growth of the pellets

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